As you mention SD-WAN, be aware that there is no IKE when using the SD-WAN feature on the Meraki MX appliances. All key-distribution is cloud-brokered.
@sj093 : Cisco Meraki uses IPSec for Site-to-site and Client VPN. IPSec is a framework for securing the IP layer. In this suite, modes and protocols are combined to tailor fit the security methods to the intended use. Cisco Meraki VPNs use the following mode+protocol for Site-to-Site VPN communication
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